Open the ADF....at the side of the large glass you will see a thin strip of glass maybe about 1/4 ~1/2 inch wide...there is probably some corrector fluid or glue or scotch tape on the **** of glass causing the problem.

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This was my exact problem. When scanning from the ADF, I had a vertical black line down every page. I cleaned the larger glass surface several times with no effect. Then, I discovered that ADF scans do NOT use the large glass area, but use the smaller, thinner glass area on the left side. It has a piece of thin plastic over the top of the glass. The scanner is fixed and the paper rolls through this area. So, if a speck of dirt is under the thin plastic piece or on top of the glass or on top of the thin plastic, it results in a black line down the whole page. Aha, so now I cleaned the thin plastic (both sides) and the top of the glass under the thin plastic - actually saw the black dot that was causing the problem and voila, problem solved.

Sounds like a fusing error . If your able to wipe the toner off the page its a fuser unit problem (replace fuser unit).

Also clean the copier's paper rollers. Marks on copies will occasionally be the result of a dirty paper-rolling mechanism. Simply access these rollers (your photocopier will likely have a plaque or series of signs indicating the locations of these areas) and wipe them off.

Clean the copier bed's glass plate. One of the most common causes of blemishes in photocopies is a dirty glass plate. In some cases a permanent mark, such as a scratch, will be present on the plate, showing up in every copy as a dark line or spot. However, most problems attributed to the glass plate can be fixed by wiping the plate with a soft towel and common household glass cleaner.

Clear any excess toner that has spilled or overflowed in the toner cartridge chamber. Excess toner will almost always result in blemishes on your copies. The most effective means of cleanup is to remove the toner cartridge and set it aside, thoroughly cleaning up any spilled toner in the compartment before putting the cartridge back in place.

Check for low toner levels. Low toner levels can actually contribute to unsightly lines and blotches on a photocopy. Most photocopiers will automatically indicate the need to replace an empty or low toner cartridge; while the toner is low, these models will permit continued copying. Consult your photocopier's instruction manual or key to warning lights and indicators for how to tell if the toner is low or empty.

There is a separate scanner glass from the flatbed scanner glass.Without a make/model I cannot tell you exactly how to access it, but once you have uncovered the document feed scanner glass area, the glass will need to be cleaned well, and then you will be able to scan from the feeder without the black line appearing.

Clean the adf scanner glass. This is the thinner strip of glass that is just to the left of the large original glass. Just lift up the top feeder and look to the left side of the glass. Clean this strip of glass with a soft cloth and some glass cleaner. Sometimes whatever is stuck to the glass is hard to get off so keep at it till it goes away. Another tip is if the line is in the middle of the copy then the "spot" to clean is going to be in the center of this strip from front to back. If the line is to the left side of your copy then the spot is going to be towards the front side.
Good Luck and Than You for using Fixya
WheatlandServices

If this only occurs with copies (not with printed jobs), then your problem is most likely dust/dirt on the scanner (not necessarily the glass), or on the optics that feed the image to the scanner. If it's on print jobs also, it could be a simple image drum problem (they wear out over time, and frequently manifest their impending failure with vertical lines appearing down printed/copied pages.

Your glass is dirty. The reason you don't get it from the ADF is because it uses a smaller different glass ahead of the glass that you use when you put it on the scanner. Clean the glass using a lint free cloth and some glass cleaner or, better yet, lens cleaner.

You're right. There is probably debris on the glass where the paper passes through. It's a common problem. You'll have to raise up the scanner so that you can see the glass. Then clean it off and you're back on business.

Is it the same result when you place the original on the glass as when you use the Automatic feeder? If copy is straight when you use the glass, then the rollers on the feeder need cleaning (with a damp cloth) -Lift the cover where paper feeds and clean grey rollers,also, and more importantly, clean the darker roller which has a plastic white roller pressed to it with a heavy spring assembly.If copies are slanted either way you make a copy, make sure to check the paper guides in the tray are snug

There must be a strip of glass about one inch wide, next to
the large glass. There is the problem !
Clean that strip thourougly. When you use the feeder the pages
are scanned thru the small strip of glass.